Free convection is the area of fluid mechanics dealing with the motion of a fluid arising from temperature differences within the fluid. This contrasts with forced convection[?].
A typical example is hot air rising off a on oil radiator, and then circulating around a room.
... Dalí, artist
May 17 - Jean Gabin[?], actor (+ 1976)
May 21 - Fats Waller, pianist (+ 1943)
May 21 - Robert Montgomery, actor (+ 1981)
June 2 - Johnny ...